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          Java并发学习记录之wait/notify机制
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        <p>为了支持多线程之间的协作，JDK提供了两个非常重要的接口线程等待 <code>wait()</code> 方法和<br>通知 <code>notify()</code> 方法。</p>
<span id="more"></span>

<h1 id="Java-并发学习记录之-wait-notify-机制"><a href="#Java-并发学习记录之-wait-notify-机制" class="headerlink" title="Java 并发学习记录之 wait/notify 机制"></a>Java 并发学习记录之 wait/notify 机制</h1><p>为了支持多线程之间的协作，JDK提供了两个非常重要的接口线程等待 <code>wait()</code> 方法和<br>通知 <code>notify()</code> 方法。</p>
<ul>
<li><code>wait()</code>: 使调用该方法的线程释放共享资源锁，然后从运行状态退出，进入等待队列，直到被再次唤醒</li>
<li><code>notify()</code>: 随机唤醒等待队列中等待同一共享资源的 “一个线程”，<br>并使该线程退出等待队列，进入可运行状态，也就是 <code>notify()</code> 方法仅通知“一个线程”</li>
<li><code>wait(long)</code>: 超时等待一段时间，这里的参数时间是毫秒，也就是等待长达n毫秒，<br>如果没有通知就超时返回</li>
<li><code>wait(long, int)</code>: 对于超时时间更细力度的控制，可以达到纳秒</li>
<li><code>notifyAll()</code>: 使所有正在等待队列中等待同一共享资源的 “全部线程” 退出等待队列，<br>进入可运行状态。此时，优先级最高的那个线程最先执行，但也有可能是随机执行，<br>这取决于JVM虚拟机的实现</li>
</ul>
<p>文字表达太枯燥了，作图演示有关线程状态的变化：</p>
<p><img src="https://img-blog.csdnimg.cn/20190226100712829.png?x-oss-process=image/watermark,type_ZmFuZ3poZW5naGVpdGk,shadow_10,text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L0xpdHRsZV9meGM=,size_16,color_FFFFFF,t_70" alt="在这里插入图片描述"></p>
<h2 id="简单实例演示"><a href="#简单实例演示" class="headerlink" title="简单实例演示"></a>简单实例演示</h2><figure class="highlight java"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br><span class="line">24</span><br><span class="line">25</span><br><span class="line">26</span><br><span class="line">27</span><br><span class="line">28</span><br><span class="line">29</span><br><span class="line">30</span><br><span class="line">31</span><br><span class="line">32</span><br><span class="line">33</span><br><span class="line">34</span><br><span class="line">35</span><br><span class="line">36</span><br><span class="line">37</span><br><span class="line">38</span><br><span class="line">39</span><br><span class="line">40</span><br><span class="line">41</span><br><span class="line">42</span><br><span class="line">43</span><br><span class="line">44</span><br><span class="line">45</span><br><span class="line">46</span><br><span class="line">47</span><br><span class="line">48</span><br></pre></td><td class="code"><pre><span class="line"><span class="keyword">package</span> com.littlefxc.examples.base.thread;</span><br><span class="line"></span><br><span class="line"><span class="comment">/**</span></span><br><span class="line"><span class="comment"> * <span class="doctag">@author</span> fengxuechao</span></span><br><span class="line"><span class="comment"> * <span class="doctag">@date</span> 2019/2/22</span></span><br><span class="line"><span class="comment"> **/</span></span><br><span class="line"><span class="keyword">public</span> <span class="class"><span class="keyword">class</span> <span class="title">WaitNotifySample</span> </span>&#123;</span><br><span class="line"></span><br><span class="line">    <span class="function"><span class="keyword">public</span> <span class="keyword">static</span> <span class="keyword">void</span> <span class="title">main</span><span class="params">(String[] args)</span> </span>&#123;</span><br><span class="line">        Thread t1 = <span class="keyword">new</span> WaitThread();</span><br><span class="line">        Thread t2 = <span class="keyword">new</span> NotifyThread();</span><br><span class="line">        t1.start();</span><br><span class="line">        t2.start();</span><br><span class="line">    &#125;</span><br><span class="line"></span><br><span class="line">    <span class="keyword">private</span> <span class="keyword">static</span> <span class="class"><span class="keyword">class</span> <span class="title">WaitThread</span> <span class="keyword">extends</span> <span class="title">Thread</span> </span>&#123;</span><br><span class="line">        <span class="meta">@Override</span></span><br><span class="line">        <span class="function"><span class="keyword">public</span> <span class="keyword">void</span> <span class="title">run</span><span class="params">()</span> </span>&#123;</span><br><span class="line">            <span class="keyword">synchronized</span> (WaitNotifySample.class) &#123;</span><br><span class="line">                System.out.println(<span class="string">&quot;线程1:开始&quot;</span>);</span><br><span class="line">                <span class="keyword">try</span> &#123;</span><br><span class="line">                    System.out.println(<span class="string">&quot;线程1:等待中。。。&quot;</span>);</span><br><span class="line">                    WaitNotifySample.class.wait();</span><br><span class="line">                &#125; <span class="keyword">catch</span> (InterruptedException e) &#123;</span><br><span class="line">                    e.printStackTrace();</span><br><span class="line">                &#125;</span><br><span class="line">                System.out.println(<span class="string">&quot;线程1:结束&quot;</span>);</span><br><span class="line">            &#125;</span><br><span class="line">        &#125;</span><br><span class="line">    &#125;</span><br><span class="line"></span><br><span class="line">    <span class="keyword">private</span> <span class="keyword">static</span> <span class="class"><span class="keyword">class</span> <span class="title">NotifyThread</span> <span class="keyword">extends</span> <span class="title">Thread</span> </span>&#123;</span><br><span class="line">        <span class="meta">@Override</span></span><br><span class="line">        <span class="function"><span class="keyword">public</span> <span class="keyword">void</span> <span class="title">run</span><span class="params">()</span> </span>&#123;</span><br><span class="line">            <span class="keyword">synchronized</span> (WaitNotifySample.class) &#123;</span><br><span class="line">                System.out.println(<span class="string">&quot;线程2:开始&quot;</span>);</span><br><span class="line">                WaitNotifySample.class.notify();</span><br><span class="line">                System.out.println(<span class="string">&quot;线程2:notify() 后必须等待 synchronized 代码执行完后才释放&quot;</span>);</span><br><span class="line">                <span class="keyword">try</span> &#123;</span><br><span class="line">                    Thread.sleep(<span class="number">2000</span>);</span><br><span class="line">                &#125; <span class="keyword">catch</span> (InterruptedException e) &#123;</span><br><span class="line">                    e.printStackTrace();</span><br><span class="line">                &#125;</span><br><span class="line">                System.out.println(<span class="string">&quot;线程2:结束&quot;</span>);</span><br><span class="line">            &#125;</span><br><span class="line">        &#125;</span><br><span class="line">    &#125;</span><br><span class="line">&#125;</span><br></pre></td></tr></table></figure>

<p>执行结果：</p>
<p><img src="https://img-blog.csdnimg.cn/20190226100738541.png" alt="在这里插入图片描述"></p>
<h3 id="代码分析："><a href="#代码分析：" class="headerlink" title="代码分析："></a>代码分析：</h3><p>开启了两个线程 t1, t2。</p>
<ol>
<li>t1首先获得锁，在执行 <code>wait()</code> 方法前先要申请锁，<br>其中 <code>synchronized(WaitNotifySample.class)</code> 这样写不要觉得奇怪(Java编程思想：一切都是对象)<br>我只是图方便而已，</li>
<li>所以在执行 <code>wait()</code> 方法时，它是持有 <code>WaitNotifySample.class</code> 的锁的。</li>
<li><code>wait()</code> 方法后，t1 会进行等待，并释放 <code>WaitNotifySample.class</code> 的锁。</li>
<li>t2 线程在执行 <code>notify()</code> 前也会申请 <code>WaitNotifySample.class</code> 的锁.</li>
<li><strong><code>notify()</code> 方法后并不会立即释放锁, 而是必须执行完notify()方法所在的synchronized代码块后才释放。</strong><br>我在这里让 t2 睡眠两秒使得效果更加明显.</li>
</ol>
<h3 id="wait-与-sleep-的区别"><a href="#wait-与-sleep-的区别" class="headerlink" title="wait() 与 sleep() 的区别"></a>wait() 与 sleep() 的区别</h3><p>从上面的执行结果也可以看出来, <code>wait()</code> 方法后当前线程是会释放目标对象的锁, 而 <code>sleep()</code> 仍然是阻塞的说明线程没有释放任何资源.</p>

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